Toshiba Super MMU-AP0151SH Installation Manual page 16

5
REFRIGERANT PIPING
• Projection margin in flaring :
B (Unit : mm)
Rigid (Clutch type)
R410A tool used
Outer diam. of
copper pipe
R410A
6.4 0 to 0.5 (Same as left)
9.5 0 to 0.5 (Same as left)
12.7 0 to 0.5 (Same as left)
15.9 0 to 0.5 (Same as left)
Imperial (Wing nut type)
Outer diam. of copper pipe
6.4
9.5
12.7
15.9
Connection of refrigerant pipe
Connect all the refrigerant pipes with flare connecting
work.
• Since the atmospheric pressure only is sealed
as the sealing gas, it is not abnormal that
"Pushu..." sound is not heard when the flare
nut is removed.
• Be sure to use a double spanner for pipe
connecting work of the indoor unit.
Work using double spanner
• Refer to the following table for tightening torque.
Connecting pipe Tightening torque
outer dia. (mm)
Ø6.4 14 to 18 (1.4 to 1.8 kgf•m)
Ø9.5 33 to 42 (3.3 to 4.2 kgf•m)
Ø12.7 50 to 62 (5.0 to 6.2 kgf•m)
Ø15.9 68 to 82 (6.8 to 8.2 kgf•m)
Conventional tool used
R22 R410A R22
1.0 to 1.5 0.5 to 1.0
1.0 to 1.5 0.5 to 1.0
1.0 to 1.5 0.5 to 1.0
1.0 to 1.5 0.5 to 1.0
R410A R22
1.5 to 2.0 1.0 to 1.5
1.5 to 2.0 1.0 to 1.5
2.0 to 2.5 1.5 to 2.0
2.0 to 2.5 1.5 to 2.0
Re-tightening
(N•m) torque (N•m)
18 (1.8 kgf•m)
42 (4.2 kgf•m)
50 (5.0 kgf•m)
68 (6.8 kgf•m)
B
Airtight test/Air purge, etc.
For airtight test, air purge, addition of refrigerant, and
gas leak check, follow the Installation Manual attached
to the outdoor unit.
Be sure to use the tool such as charge hose
exclusive to R410A.
Do not turn on the power until the airtight test and
the vacuuming have finished. (If turning on the
power, the incorporated PMV is closed fully and the
period until the vacuuming finishes elongates.
Open fully valves of the outdoor unit
Gas leak check
Check with a leak detector or soap water whether gas
leaks or not, from the pipe connecting section or cap of
the valve.
Use a leak detector manufactured exclusively for
HFC refrigerant (R410A, R134a, etc.).
Heat insulating process
Perform heat insulating for pipes at liquid side and gas
side separately.
In cooling time, temperature at both liquid and gas sides
becomes lower.
Therefore, perform heat insulating process sufficiently
to avoid dewing.
• For heat insulator of pipe at gas side, be sure to use
one with heat-resisting temp.120°C or more.
• Using the attached heat insulating pipe, perform heat
insulating process securely for pipe connecting part of
the indoor units without clearance.
Apply the thermal insulation to the pipe connecting
section of the indoor unit securely up to the root
without exposure of the pipe.
(The pipe exposed to the outside causes water leak.)
Main unit
Attached heat insulating pipe
13
REQUIREMENT
REQUIREMENT
REQUIREMENT
Set notching upward.
Pipe side
(Required at the site)